Nuclear cross sections at high transverse energy

Analysis of the ratios of nuclear to hadronic transverse-energy spectra and of central particle production vs numbers of participant nucleons shows that models of low-$p_t$ particle production not incorporating "energy conservation" provide good fits to the data at low $E_t$ or low $A\mathrm{}(A=4\mathrm{})\mathrm{}$ but disagree strongly with the data at large $E_t$ and large $A(A>~27)$, where the measurements are sensitive to large numbers of successive scatters.